I'm really not sure what your asking, but if your trying to solve for x it should be basic algebra.
12+x=-2
12+x-12=-2-12 subtract 12 from both sides
x=-14
12+(-14)=-2
Is this what you're after? if not could you be a little more specific?
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x = 4
X=1.42857142857143
4 x 2 + 4 = 12 x = 4
5x + 2 = x + 12 5x - x = 12 - 2 4x = 10 x = 10/4 x = 5/2 or 2.5
The slope of -x plus 6y is equals to 12 is said to be (2 + 1/6x).